VELOCITY OF SOUND IN LIQUID HELIUM AT LOW TEMPERATURES

Journal Article · Sat Sep 15 04:00:00 EDT 1962 · Phys. Rev. Letters

DOI:https://doi.org/10.1103/PhysRevLett.9.243· OSTI ID:4759286

Whitney, W M

The velocity of ordinary sound in liquid helium was measured at a frequency of 1 Mc/sec between 0.1 deg K and 1.7 deg K. The observed change in velocity between the lowest temperatures and 1.6 deg K is 3.86 plus or minus 0.1 m/sec, and the value for the velocity extrapolated to absolute zero is 238.27 plus or minus 0.1 m/sec. The most significant result is the discovery of a definite maximum in the velocity at 0.68 deg K. The calculated and experimental curves of the sound velocity have roughly the same characteristics, but theory does not account for the results quantitatively. Some of the possible reasons for this discrepancy are briefly discussed. (H.D.R.)

• Research Organization: Massachusetts Inst. of Tech., Cambridge
• NSA Number: NSA-17-003633
• OSTI ID: 4759286
• Journal Information: Phys. Rev. Letters, Journal Name: Phys. Rev. Letters Vol. Vol: 9
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

FREQUENCY
HELIUM
LIQUIDS
LOW TEMPERATURE
MEASURED VALUES
PHYSICS
SOUND
VELOCITY